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Report No.
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Crack growth analyses of SCC under various residual stress distributions near the piping butt-welding

Katsuyama, Jinya  ; Asano, Wataru*; Onizawa, Kunio ; Mochizuki, Masahito*; Toyoda, Masao*

Stress corrosion cracking (SCC) of recirculation pipes of austenite stainless steel has been observed. The SCC initiates and grows near the welding zone because of high tensile residual stress by welding. Therefore, the residual stress analysis due to welds of piping is becoming important. In present work, the through-thickness residual stress distributions near multi-pass butt-welds of Type 316L pipes have been calculated by thermo-elastic-plastic analyses. Then crack growth simulations were performed using calculated residual stress distributions. The effects of geometric and welding conditions on crack growth behavior were also discussed.

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